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Extractive Spectrophotometric Speciation of Iron(II) and Iron(III) Using 4-(2-Pyridyl-azo)Resorcinol and 1-Hexadecylpyridinium Bromide with the Partial Least-Squares Method
Authors: Kiaie Seyed Hossein | Soltanian Sepideh | Babakhanian Arash | Ashrafi Amir Mansoor | Švancara Ivan
Year: 2015
Type of publication: článek v odborném periodiku
Name of source: Scientific Papers of the University of Pardubice, Series A, Faculty of Chemical Technology
Page from-to: 5-20
Titles:
Language Name Abstract Keywords
cze Extraktivní spektrofotometrická speciace železa ve formě Fe(II) a Fe(III) po reakci 4-(2-pyridyl-azo)resorcinolu a 1-hexadecylpyridinium bromidu a s využitím metody nejmenších čtverců Předmětem příspěvku je spektrofotometrickýá metoda, schipná speciace (rozlišení) forem FeII a FeIII s využitím reakce s činidlem PAR a náásledné extrakci vzniklých produktů, jejichž složení a vzájemné zastiopupení je vyhodnoceno statisticky -- pomocí metody nejmenších čtverců. Využitelnost metody bylo ukázáno na analýze vzorků farmaceutických preparátů. Spektrofotometrie; FeII + FeIII; Extrakce, Komplex(y) s PAR; Speciace; Metoda nejmenších čtverců.
eng Extractive Spectrophotometric Speciation of Iron(II) and Iron(III) Using 4-(2-Pyridyl-azo)Resorcinol and 1-Hexadecylpyridinium Bromide with the Partial Least-Squares Method A novel method has been developed for extractive spectrophotometric determination of Fe(II) and Fe(III) utilising the formation of the colour complexes with PAR, i.e., 4-(2-pyridylazo) resorcinol, their instantaneous ion-pairing with 1-hexadecylpyridinium counter ion (HDP+) in aqueous solution at pH 8.1, and subsequent extraction onto the organic phase of methyl isobutyl ketone (MIBK), where both ion-associates can sensitively be detected spectrophotometrically. A statistical method based on the partial least squares (PLS) has then been used to define a model between calibration spectra and the corresponding concentrations. The quantitative PLS model was proposed for absorption spectra in the 350-750 nm range from the data obtained by analysing 25 various mixtures of both iron forms. Their concentration in the calibration matrix was 0.3-1.1 ppm for both Fe(II) and Fe(III); the detection limits being estimated to be 0.09 and 0.13 ppm, respectively. The performance of proposed model has been confirmed by discriminating and determining both Fe(II) and Fe(III) in model solutions and real samples of pharmaceutical formulations. Spectrophotometry; Fe(II) + Fe(III); Extraction; PAR complex(es); Speciation; Partial least-squares method.

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